Помогите!
Из данных равенств выберите тождество:
1) 4у-8=4( у-2)
2) х+(3х-4)=3х-4
3) a-b+c= -(b-a-c)
4) 9а- ( b+c)=9a-b-c
5) 2у-6=2( у-1)
6) 2,5х+1,7х-3,2х=х.
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